OpenAI: gpt-oss-20b (free) API Pricing FREE
by openai · 131K context window ·
Explore the groundbreaking OpenAI gpt-oss-20b API, now completely free! Ideal for ML engineers evaluating LLMs, this open-source model boasts a massive 131,072 token context window with zero cost for both input and output tokens ($0.00000/1M tokens). Develop and experiment without budget constraints. For example, processing 100 million tokens monthly would cost you absolutely nothing, allowing you to focus on innovation rather than API expenses. Leverage the power of OpenAI's technology risk-free and compare gpt-oss-20b against other paid LLM solutions. Start building today!
Monthly Cost Examples
Assuming 50% input / 50% output token split
| Usage | Monthly cost |
|---|---|
| 100K tokens/month | $0.00 |
| 1M tokens/month | $0.00 |
| 10M tokens/month | $0.00 |
| 100M tokens/month | $0.00 |
Compare with other models
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StormRouter sends each request to the cheapest model that can handle it.
Only use OpenAI: gpt-oss-20b (free) when your quality requirements demand it.